How old are PhD students usually?

PhD requires a rigorous coursework and training. It is one of the highest achievements in the field of academics. Most individuals start their PhD at the age of 25 and 35 years old. But it usually depends on the individual as a PhD is a bigger degree, requiring more dedication and hard work. One either chooses to pursue their PhD directly after their 4 years of Bachelor, if qualified or many choose to pursue it after their Masters. Most individuals finish their PhD by the age of 28 – 35.